Solana’s Alpenglow consensus upgrade did not launch on mainnet on September 28, despite media reports linking the date to the upgrade. The date referred to a general window for mainnet feature activations rather than an Alpenglow-specific deployment. Roger Wattenhofer, head of research at Anza and a professor at ETH Zurich, said the protocol had only recently entered public testing and questioned activating it after only a few days. Solana co-founder Anatoly Yakovenko replied to the discussion with "decel," crypto slang for slowing down. The date came from Anza’s Agave v4.3 release schedule, which lists September 28 for the resumption of mainnet feature activation but does not mention Alpenglow. A tentative Agave v4.4 timeline lists November 9 as the next mainnet activation window, also without naming the upgrade. Alpenglow targets 150-millisecond finality, compared with roughly 12.8 seconds for full finality today. SOL traded at $119.85, down 0.36% over 24 hours at press time. The upgrade remains on testnet, while Solana is also reducing block time from 400 to 200 milliseconds and has been preparing validators for Alpenglow since July.